William steombebg



(No Model.) I W. STROMBERG,

. QQMPASSBS. Patented May 6, 18811,

N. PETERS, PhmmLilhograph-n Washi mmmm y c UNITED STATES PATENT OFFICE.

' WILLIAM STROMBERG, OF ST. LOUIS, MISSOURI.

COMPASSES.

sPncIPIcA'rioN forming part of Letters Patent No. 298,038, dated May 6,1884-.

I Application filed February 26, 1884. (No model.)

T at whom it may concern:

Be it known that I, WILLIAM STROMBERG, of St. Louis, Missouri, have madea new and useful Improvement in Compasses, of which the following is afull, clear, and exact description, reference being had to the annexeddrawings, making part of this specification, in which v I Figure 1 is aview in perspective of the improved compasses, and Fig. 2 a sideelevation of the upper portion of the compasses.

The same letters of reference denote the same parts.

The present invention is an improvement in r 5 that class of compasseswhich have an adjusting and retaining arrangement, and more especiallythose compasses having an are which is attached to one of thecompass-legs, and projects thence to work throughor upon the oth er ofthe com pass-legs. As such compasses have hitherto been made, the archas been made to project from the leg to which it is attached, so as toengage with the other leg at a point between the compass-head and thecompass-points. As thus made, the are is very much in the way inhandling the compasses. The compasses are rarely opened to the fullextent of the arc, and whenever they are not so opened the projectingend of the arc is liable to catch upon or rub against the sleeve as theoperator is rotating the compasses. The compasses also requireconsiderable space in the tool-box or in packing. To obviate thisdifticulty, and to provide compasses Whose con- 5 struction is morecompact, and which can be more readily manipulated, is the aim of thisimprovement, which consists, substantially, as follows:

A represents compasses having the improve- 0 ment. Aside from theimprovement, the compasses are of the usual description, having theusual head or knuckle, B, and legs 0 O.

D represents the arc. It is connected with one, O,of the compass-legs;but in place of projecting inwardly from that leg, so as to meet theother leg, C, at a point between the head and the point of the leg 0, itis extended outward and upward from the leg 0, curving around suitablyin circular form, and finally passing through a slot, 0, in anextension, 0, of the leg 0. This extension 0 is formed, preferably, byextending the leg 0 directly upward from the region of the knuckle B. Ido not, however, wish to be limited to the precise form shownof theextension 0 It might be varied somewhat from that shown; but howevermade, it should be so extended and constructed as to meet and receivethe are when shaped and extended as described. A

suitable setscrew, E, is employed for retaining the legs in any desiredrelative position. The set-screw works through the extension 0", and itspoint is adapted to bear upon the side of the are D. The opposite side,d, of the are may have a graduation, d, Fig. 2, to enable the operatorto open the points of the compasses to any desired extent. Thegraduation is suitably proportioned to the other parts of theinstrument, so thatthe operator can, by reading the graduation,determine how far apart the compass-points are.

I claim The compasses A, having the are D extended from the leg Ooutward, upward, over the knuckle B, and engaging with the extension 0of the leg 0, substantially as described.

VV'M; STROMBERG. Witnesses:

O. D. MOODY, G. E. HUNT.

